How severe is CVE-2019-5303?

CVE-2019-5303 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-5303 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-5303?

CVE-2019-5303 primarily affects Huawei Alp-al00b Firmware. In total, 47 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-5303?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-5303 published?

CVE-2019-5303 was published on 2020-04-27 and last updated on 2026-06-17.

CVE-2019-5303

CVE-2019-5303 is a medium-severity vulnerability in Huawei Alp-al00b Firmware with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 2.9
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Huawei Alp-al00b Firmware
Published: 2020-04-27
Last modified: 2026-06-17

Description

There are two denial of service vulnerabilities on some Huawei smartphones. An attacker may send specially crafted TD-SCDMA messages from a rogue base station to the affected devices. Due to insufficient input validation of two values when parsing the messages, successful exploit may cause device abnormal. This is 2 out of 2 vulnerabilities. Different than CVE-2020-5302. Affected products are: ALP-AL00B: earlier than 9.1.0.333(C00E333R2P1T8) ALP-L09: earlier than 9.1.0.300(C432E4R1P9T8) ALP-L29: earlier than 9.1.0.315(C636E5R1P13T8) BLA-L29C: earlier than 9.1.0.321(C636E4R1P14T8), earlier than 9.1.0.330(C432E6R1P12T8), earlier than 9.1.0.302(C635E4R1P13T8) Berkeley-AL20: earlier than 9.1.0.333(C00E333R2P1T8) Berkeley-L09: earlier than 9.1.0.350(C10E3R1P14T8), earlier than 9.1.0.351(C432E5R1P13T8), earlier than 9.1.0.350(C636E4R1P13T8) Charlotte-L09C: earlier than 9.1.0.311(C185E4R1P11T8), earlier than 9.1.0.345(C432E8R1P11T8) Charlotte-L29C: earlier than 9.1.0.325(C185E4R1P11T8), earlier than 9.1.0.335(C636E3R1P13T8), earlier than 9.1.0.345(C432E8R1P11T8), earlier than 9.1.0.336(C605E3R1P12T8) Columbia-AL10B: earlier than 9.1.0.333(C00E333R1P1T8) Columbia-L29D: earlier than 9.1.0.350(C461E3R1P11T8), earlier than 9.1.0.350(C185E3R1P12T8), earlier than 9.1.0.350(C10E5R1P14T8), earlier than 9.1.0.351(C432E5R1P13T8) Cornell-AL00A: earlier than 9.1.0.333(C00E333R1P1T8) Cornell-L29A: earlier than 9.1.0.328(C185E1R1P9T8), earlier than 9.1.0.328(C432E1R1P9T8), earlier than 9.1.0.330(C461E1R1P9T8), earlier than 9.1.0.328(C636E2R1P12T8) Emily-L09C: earlier than 9.1.0.336(C605E4R1P12T8), earlier than 9.1.0.311(C185E2R1P12T8), earlier than 9.1.0.345(C432E10R1P12T8) Emily-L29C: earlier than 9.1.0.311(C605E2R1P12T8), earlier than 9.1.0.311(C636E7R1P13T8), earlier than 9.1.0.311(C432E7R1P11T8) Ever-L29B: earlier than 9.1.0.311(C185E3R3P1), earlier than 9.1.0.310(C636E3R2P1), earlier than 9.1.0.310(C432E3R1P12) HUAWEI Mate 20: earlier than 9.1.0.131(C00E131R3P1) HUAWEI Mate 20 Pro: earlier than 9.1.0.310(C185E10R2P1) HUAWEI Mate 20 RS: earlier than 9.1.0.135(C786E133R3P1) HUAWEI Mate 20 X: earlier than 9.1.0.135(C00E133R2P1) HUAWEI P20: earlier than 9.1.0.333(C00E333R1P1T8) HUAWEI P20 Pro: earlier than 9.1.0.333(C00E333R1P1T8) HUAWEI P30: earlier than 9.1.0.193 HUAWEI P30 Pro: earlier than 9.1.0.186(C00E180R2P1) HUAWEI Y9 2019: earlier than 9.1.0.220(C605E3R1P1T8) HUAWEI nova lite 3: earlier than 9.1.0.305(C635E8R2P2) Honor 10 Lite: earlier than 9.1.0.283(C605E8R2P2) Honor 8X: earlier than 9.1.0.221(C461E2R1P1T8) Honor View 20: earlier than 9.1.0.238(C432E1R3P1) Jackman-L22: earlier than 9.1.0.247(C636E2R4P1T8) Paris-L21B: earlier than 9.1.0.331(C432E1R1P2T8) Paris-L21MEB: earlier than 9.1.0.331(C185E4R1P3T8) Paris-L29B: earlier than 9.1.0.331(C636E1R1P3T8) Sydney-AL00: earlier than 9.1.0.212(C00E62R1P7T8) Sydney-L21: earlier than 9.1.0.215(C432E1R1P1T8), earlier than 9.1.0.213(C185E1R1P1T8) Sydney-L21BR: earlier than 9.1.0.213(C185E1R1P2T8) Sydney-L22: earlier than 9.1.0.258(C636E1R1P1T8) Sydney-L22BR: earlier than 9.1.0.258(C636E1R1P1T8) SydneyM-AL00: earlier than 9.1.0.228(C00E78R1P7T8) SydneyM-L01: earlier than 9.1.0.215(C782E2R1P1T8), earlier than 9.1.0.213(C185E1R1P1T8), earlier than 9.1.0.270(C432E3R1P1T8) SydneyM-L03: earlier than 9.1.0.217(C605E1R1P1T8) SydneyM-L21: earlier than 9.1.0.221(C461E1R1P1T8), earlier than 9.1.0.215(C432E4R1P1T8) SydneyM-L22: earlier than 9.1.0.259(C185E1R1P2T8), earlier than 9.1.0.220(C635E1R1P2T8), earlier than 9.1.0.216(C569E1R1P1T8) SydneyM-L23: earlier than 9.1.0.226(C605E2R1P1T8) Yale-L21A: earlier than 9.1.0.154(C432E2R3P2), earlier than 9.1.0.154(C461E2R2P1), earlier than 9.1.0.154(C636E2R2P1) Honor 20: earlier than 9.1.0.152(C00E150R5P1) Honor Magic2: earlier than 10.0.0.187 Honor V20: earlier than 9.1.0.234(C00E234R4P3)

Frequently asked questions

What is CVE-2019-5303?: There are two denial of service vulnerabilities on some Huawei smartphones. An attacker may send specially crafted TD-SCDMA messages from a rogue base station to the affected devices. Due to insufficient input validation of two values when parsing the messages, successful exploit may cause device abnormal. This is 2 out of 2 vulnerabilities. Different than CVE-2020-5302. Affected products are: ALP-AL00B: earlier than 9.1.0.333(C00E333R2P1T8) ALP-L09: earlier than 9.1.0.300(C432E4R1P9T8) ALP-L29: earlier than 9.1.0.315(C636E5R1P13T8) BLA-L29C: earlier than 9.1.0.321(C636E4R1P14T8), earlier than 9.1.0.330(C432E6R1P12T8), earlier than 9.1.0.302(C635E4R1P13T8) Berkeley-AL20: earlier than 9.1.0.333(C00E333R2P1T8) Berkeley-L09: earlier than 9.1.0.350(C10E3R1P14T8), earlier than 9.1.0.351(C432E5R1P13T8), earlier than 9.1.0.350(C636E4R1P13T8) Charlotte-L09C: earlier than 9.1.0.311(C185E4R1P11T8), earlier than 9.1.0.345(C432E8R1P11T8) Charlotte-L29C: earlier than 9.1.0.325(C185E4R1P11T8), earlier than 9.1.0.335(C636E3R1P13T8), earlier than 9.1.0.345(C432E8R1P11T8), earlier than 9.1.0.336(C605E3R1P12T8) Columbia-AL10B: earlier than 9.1.0.333(C00E333R1P1T8) Columbia-L29D: earlier than 9.1.0.350(C461E3R1P11T8), earlier than 9.1.0.350(C185E3R1P12T8), earlier than 9.1.0.350(C10E5R1P14T8), earlier than 9.1.0.351(C432E5R1P13T8) Cornell-AL00A: earlier than 9.1.0.333(C00E333R1P1T8) Cornell-L29A: earlier than 9.1.0.328(C185E1R1P9T8), earlier than 9.1.0.328(C432E1R1P9T8), earlier than 9.1.0.330(C461E1R1P9T8), earlier than 9.1.0.328(C636E2R1P12T8) Emily-L09C: earlier than 9.1.0.336(C605E4R1P12T8), earlier than 9.1.0.311(C185E2R1P12T8), earlier than 9.1.0.345(C432E10R1P12T8) Emily-L29C: earlier than 9.1.0.311(C605E2R1P12T8), earlier than 9.1.0.311(C636E7R1P13T8), earlier than 9.1.0.311(C432E7R1P11T8) Ever-L29B: earlier than 9.1.0.311(C185E3R3P1), earlier than 9.1.0.310(C636E3R2P1), earlier than 9.1.0.310(C432E3R1P12) HUAWEI Mate 20: earlier than 9.1.0.131(C00E131R3P1) HUAWEI Mate 20 Pro: earlier than 9.1.0.310(C185E10R2P1) HUAWEI Mate 20 RS: earlier than 9.1.0.135(C786E133R3P1) HUAWEI Mate 20 X: earlier than 9.1.0.135(C00E133R2P1) HUAWEI P20: earlier than 9.1.0.333(C00E333R1P1T8) HUAWEI P20 Pro: earlier than 9.1.0.333(C00E333R1P1T8) HUAWEI P30: earlier than 9.1.0.193 HUAWEI P30 Pro: earlier than 9.1.0.186(C00E180R2P1) HUAWEI Y9 2019: earlier than 9.1.0.220(C605E3R1P1T8) HUAWEI nova lite 3: earlier than 9.1.0.305(C635E8R2P2) Honor 10 Lite: earlier than 9.1.0.283(C605E8R2P2) Honor 8X: earlier than 9.1.0.221(C461E2R1P1T8) Honor View 20: earlier than 9.1.0.238(C432E1R3P1) Jackman-L22: earlier than 9.1.0.247(C636E2R4P1T8) Paris-L21B: earlier than 9.1.0.331(C432E1R1P2T8) Paris-L21MEB: earlier than 9.1.0.331(C185E4R1P3T8) Paris-L29B: earlier than 9.1.0.331(C636E1R1P3T8) Sydney-AL00: earlier than 9.1.0.212(C00E62R1P7T8) Sydney-L21: earlier than 9.1.0.215(C432E1R1P1T8), earlier than 9.1.0.213(C185E1R1P1T8) Sydney-L21BR: earlier than 9.1.0.213(C185E1R1P2T8) Sydney-L22: earlier than 9.1.0.258(C636E1R1P1T8) Sydney-L22BR: earlier than 9.1.0.258(C636E1R1P1T8) SydneyM-AL00: earlier than 9.1.0.228(C00E78R1P7T8) SydneyM-L01: earlier than 9.1.0.215(C782E2R1P1T8), earlier than 9.1.0.213(C185E1R1P1T8), earlier than 9.1.0.270(C432E3R1P1T8) SydneyM-L03: earlier than 9.1.0.217(C605E1R1P1T8) SydneyM-L21: earlier than 9.1.0.221(C461E1R1P1T8), earlier than 9.1.0.215(C432E4R1P1T8) SydneyM-L22: earlier than 9.1.0.259(C185E1R1P2T8), earlier than 9.1.0.220(C635E1R1P2T8), earlier than 9.1.0.216(C569E1R1P1T8) SydneyM-L23: earlier than 9.1.0.226(C605E2R1P1T8) Yale-L21A: earlier than 9.1.0.154(C432E2R3P2), earlier than 9.1.0.154(C461E2R2P1), earlier than 9.1.0.154(C636E2R2P1) Honor 20: earlier than 9.1.0.152(C00E150R5P1) Honor Magic2: earlier than 10.0.0.187 Honor V20: earlier than 9.1.0.234(C00E234R4P3)
How severe is CVE-2019-5303?: CVE-2019-5303 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-5303 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-5303?: CVE-2019-5303 primarily affects Huawei Alp-al00b Firmware. In total, 47 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-5303?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-5303 published?: CVE-2019-5303 was published on 2020-04-27 and last updated on 2026-06-17.

References

https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190814-01-mobile-en

Affected products (47)

cpe:2.3:o:huawei:alp-al00b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:alp-l09_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:alp-l29_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:bla-l29c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:berkeley-al20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:berkeley-l09_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:charlotte-l09c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:charlotte-l29c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:columbia-al10b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:columbia-l29d_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:cornell-al00a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:cornell-l29a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:emily-l09c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:emily-l29c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:ever-l29b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:mate_20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:mate_20_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:mate_20_rs_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:mate_20_x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:p20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:p20_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:p30_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:p30_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:y9_2019_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:nova_lite_3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:honor_10_lite_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:honor_8x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:honor_view_20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:jackman-l22_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:paris-l21b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:paris-l21meb_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:paris-l29b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:sydney-al00_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:sydney-l21_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:sydney-l21br_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:sydney-l22_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:sydney-l22br_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:sydneym-al00_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:sydneym-l01_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:sydneym-l03_firmware:*:*:*:*:*:*:*:*

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